中国地质灾害与防治学报2001，Vol.12Issue(1)：75-77,3.
基坑降水总应力变化时有效应力增量和沉降量计算
The calculation of effective stress and settlement based on the variable total stress in pit dewatering
张莲花 1李荣强 2刘德坊1
作者信息
- 1. 成都理工学院工程地质研究所，四川 成都 610059
- 2. 深圳市工程地质勘察研究院，广东 深圳 518026
- 折叠
摘要
Abstract
To the question that the calculated settlement values is biggerthan practical values, the calculation of total stress and effective stress in confined and phreatic aquifers under different dewatering conditions is systematically analyzed in the paper. That the total stress in soil after dewatering is changeable, indicated in this paper. Especially in the unconfined layers that are mostly encountered in pit excavation, the total stress becomes little and the increment of effective stress is less than the decrease of pore water pressure. The calculation of total stress and effective stress based on the variable and constant principles is comparatively presented, and the settlement difference is shown applying the layerwise summation method with the practical example, the deviation of the calculated settlement resulting shows that the increment of the effective stress is not equal to decrease of the pore water pressure, the greatest deviation is in the phreatic aquifer, and up to 20%. The total stress variable principle is also applicable to the calculation of the settlement induced by drawing water in deep confined aquifers.关键词
地面沉降/有效应力增量/孔隙水压力/偏差值Key words
settlement/increment of effective stress/pore water pressure/deviation分类
天文与地球科学引用本文复制引用
张莲花,李荣强,刘德坊..基坑降水总应力变化时有效应力增量和沉降量计算[J].中国地质灾害与防治学报,2001,12(1):75-77,3.
